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6 ConcreCem against deterioration by Hydrochloric and Sulphuric acid
ConcreCem increases the durability of concrete, because of the chemical reaction between water and cement particles inside the concrete. To validate this statement tests with immersion of specimen in hydrochloric and sulphuric acid were executed.
6.1 Hydrochloric acid (36% M - 1,19 g/ml)
Two regular mortar samples of a 28-days-days-old mixture (prepared with saltwater and salt Sahara sand) have been immersed in a solution of hydrochloric acid. One sample was a mixture with 0,3% ConcreCem and the other was the same mixture but then without any ConcreCem added. The hydrochloric acid had a pH-value of 0,45.
Immediately after being immersed the samples were getting damaged. Figure 6.16 shows several pictures of the immersion in hydrochloric acid and the deterioration of the samples.
Figure 6.1: Immersion in 36% M hydrochloric acid (pH = 0,45) and deterioration of the prisms
The loss of weight was measured after a couple of minutes. Table 6.1 shows the results and figure 6.2 shows these results in a graph.
Loss of weight ratio after immersion in a solution of hydrochloric acid
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%
0 1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536
Time of immersion [minutes]
0,0% ConcreCem 0,3% ConcreCem
Figure 6.2: Loss of weight ratio after immersion in a solution of hydrochloric acid (pH = 0,45)
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Loss of weight ratio